{"title":"Improved sensitivity and security for distribution bus and feeder relays","authors":"E. Schweitzer, M.W. Feltis, A.F. Eineweihi","doi":"10.1109/WESCAN.1993.270526","DOIUrl":"https://doi.org/10.1109/WESCAN.1993.270526","url":null,"abstract":"Traditional protective equipment does not adapt readily to distribution system reconfiguration. If new settings are needed they have to be manually changed: there are no settings in reserve. The time to make or enter and test new settings slows down emergency responses and risks human error. Sometimes relay settings are not changed for emergency or abnormal switching, because it takes too long or is too difficult. System protection is compromised. Multiple setting groups, negative-sequence overcurrent elements, alarm-directed backup, and time-overcurrent element reset options improve the fault detection sensitivity and system security provided by advanced microprocessor-based distribution bus and feeder relays.<<ETX>>","PeriodicalId":146674,"journal":{"name":"IEEE WESCANEX 93 Communications, Computers and Power in the Modern Environment - Conference Proceedings","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117028938","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A wide dynamic-range phase detector for advanced communication systems application","authors":"M. Madihian","doi":"10.1109/WESCAN.1993.270573","DOIUrl":"https://doi.org/10.1109/WESCAN.1993.270573","url":null,"abstract":"The author proposes a novel phase sensitive detector with a programmable sensitivity and phase detection range for signal processing/detection in the phase domain. To generate a phase discrimination response with a specified sensitivity and detection range, a mathematical procedure is developed to represent the response in terms of a truncated trigonometric power-series of cos theta and sin theta with theta being the phase deviation of an input modulated signal. Based on mathematical results, an algorithm is developed to synthesize the detector by electronically mechanizing each power-series term using an analog multiplication, programmable coefficient scaling, and transversal summing. Employing the algorithm, the idea of a wide range linear quasi 2 pi -radian phase detector for a M-ary phase shift keying (PSK)/quadrature amplitude modulation (QAM) and phase locked loop (PLL) system application is presented. Detector performance in the presence of additive noise has been investigated to show that an input signal-to-noise power ratio higher than 10 dB will assure satisfactory system operation.<<ETX>>","PeriodicalId":146674,"journal":{"name":"IEEE WESCANEX 93 Communications, Computers and Power in the Modern Environment - Conference Proceedings","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125415847","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Transformer overload with user-defined characteristic","authors":"Z. Zhang, G. Swift, T. Molinski, G. Wong","doi":"10.1109/WESCAN.1993.270525","DOIUrl":"https://doi.org/10.1109/WESCAN.1993.270525","url":null,"abstract":"The authors describe the design and implementation of a transformer overload relay with a user-defined characteristic using a user-accessible software protection system platform which has been developed at the University of Manitoba. The relay design platform is a powerful tool for the user to design his or her own relays. With the background program provided, where many relay function routines have been written and stored in the function library, the user can easily create relay functions using the C high-level language to call the special routines. A relay of any type can be programmed. Some graphics utilities have been developed to help the user design the relay even more easily. The details of the relay prototype design are given and the platform is briefly introduced.<<ETX>>","PeriodicalId":146674,"journal":{"name":"IEEE WESCANEX 93 Communications, Computers and Power in the Modern Environment - Conference Proceedings","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123608882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Filtering for protective relays","authors":"E. Schweitzer, D. Hou","doi":"10.1109/WESCAN.1993.270548","DOIUrl":"https://doi.org/10.1109/WESCAN.1993.270548","url":null,"abstract":"The authors identify filtering requirements or criteria for different relays. They limit the discussion to relays needing precise measurements of the system-frequency component of the signals, such as distance relays. Many different filtering methods which may meet the filtering requirements are conceived and reviewed. Filtering questions are answered through requirement-assessment, analysis, simulation and examples. CAL, cosine, Fourier, correlator, least-squares and Kalman filters are considered and compared. The differences between finite and infinite impulse response filters are examined.<<ETX>>","PeriodicalId":146674,"journal":{"name":"IEEE WESCANEX 93 Communications, Computers and Power in the Modern Environment - Conference Proceedings","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126413177","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Protection scheme considerations for common generator bus configurations used in cogeneration plants","authors":"R.M. Rifaat","doi":"10.1109/WESCAN.1993.270546","DOIUrl":"https://doi.org/10.1109/WESCAN.1993.270546","url":null,"abstract":"The author discusses the applications of protective relaying schemes in modern power cogeneration plants with common generator bus arrangements. Main protection system philosophy and scheme characteristics are considered. Emphasis is given to the attributes of common generator bus configurations. High resistance neutral grounding protection sensitivity and coordinate ability are addressed. Critical considerations are identified to be evaluated in the case of plants connected to multi-tap utility transmission lines.<<ETX>>","PeriodicalId":146674,"journal":{"name":"IEEE WESCANEX 93 Communications, Computers and Power in the Modern Environment - Conference Proceedings","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131393676","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Effect of dependent outages on composite system reliability performance","authors":"R. Billinton, G. Lian","doi":"10.1109/WESCAN.1993.270564","DOIUrl":"https://doi.org/10.1109/WESCAN.1993.270564","url":null,"abstract":"The authors examine the effect of the system load level and of selected dependent outages on the reliability performance of a composite generation and transmission system using security constrained adequacy assessment. The dependent outages included in the analysis are common mode and station originated events. The studies are extended to examine the effect on the system performance of selected switching station configurations. The station topologies considered are the ring bus, one and a half breaker, and single bus configurations. The study results provide power engineers with useful and important information on the impact on the system well-being of system dependencies created by common mode failures and station configurations.<<ETX>>","PeriodicalId":146674,"journal":{"name":"IEEE WESCANEX 93 Communications, Computers and Power in the Modern Environment - Conference Proceedings","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115904211","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Integration of telecommunications switching on SCS hypercube packet switches","authors":"C. McCrosky, K. Jian, I. Reid","doi":"10.1109/WESCAN.1993.270567","DOIUrl":"https://doi.org/10.1109/WESCAN.1993.270567","url":null,"abstract":"A switch architecture is proposed which can integrate a wide range of modern service demands within one architecture and one physical realization. The proposed architecture is based on highly parallel, distributed packet interconnection networks. Hypercube-based parallel packet switches utilizing the saturated constant shuffle (SCS) algorithm appear to provide the possibility of unified services. The SCS algorithm ensures economical and highly scalable implementations. The aggregate bandwidth of these switches is available for a wide range of services. A great deal of flexibility in the allocation of this aggregate bandwidth is possible. Bandwidth can be reserved for constant bandwidth services such as telephones. Pools of bandwidth can be made available for pools of bursty traffic such as computer data; within these pools individual users can compare for bandwidth. Variable bandwidth traffic cannot consume bandwidth allocated to constant bandwidth users. The authors present the essential ideas of the proposed switch architecture, describe its performance potential, and discuss how the quality of the various services can be assured.<<ETX>>","PeriodicalId":146674,"journal":{"name":"IEEE WESCANEX 93 Communications, Computers and Power in the Modern Environment - Conference Proceedings","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124423346","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Value-based reliability evaluation of electric distribution systems","authors":"R. Billinton, J. Aweya, G. Wacker","doi":"10.1109/WESCAN.1993.270561","DOIUrl":"https://doi.org/10.1109/WESCAN.1993.270561","url":null,"abstract":"The authors describe the evaluation of the worth or value of distribution system reliability using quantitative reliability analysis and customer interruption costs. The ability to assess reliability worth makes it possible to optimize the reliability of a system by comparing the reliability worth with the associated system investment costs. The analyses include an evaluation of the reliability of different design/operating configurations of a distribution system and the corresponding reliability worths at the customer level. The reliability of each system configuration is evaluated in terms of the system performance indices and the expected customer outage costs due to power interruptions.<<ETX>>","PeriodicalId":146674,"journal":{"name":"IEEE WESCANEX 93 Communications, Computers and Power in the Modern Environment - Conference Proceedings","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114696919","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"A practical method to optimize negotiable call accesses for broadband communication networks","authors":"U. Maydell, S. Deng","doi":"10.1109/WESCAN.1993.270559","DOIUrl":"https://doi.org/10.1109/WESCAN.1993.270559","url":null,"abstract":"The optimization problem for negotiable admission control is formalized as a special version of the knapsack problem, called the flexible knapsack problem. The new flexible knapsack model expands the conventional knapsack model by allowing different bandwidth allocations for calls from the same class. The conventional knapsack approach, a model often used in resource allocation problems, can only deal with allocating a fixed bandwidth for a particular class of calls. For the new flexible knapsack problem the authors outline two exact solutions and give details for a fast, practical heuristic solution. In addition, some performance results are discussed.<<ETX>>","PeriodicalId":146674,"journal":{"name":"IEEE WESCANEX 93 Communications, Computers and Power in the Modern Environment - Conference Proceedings","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124498529","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Neural networks in control systems","authors":"D. Rao, M. Gupta, H. C. Wood","doi":"10.1109/WESCAN.1993.270588","DOIUrl":"https://doi.org/10.1109/WESCAN.1993.270588","url":null,"abstract":"Neural network structures used for system identification and control are reviewed. Due to the complexity and diversity of the properties of biological neurons, the task of compressing their complicated characteristics into a model is extremely difficult. Toward this goal, an artificial neuron, also called a unit, that receives its inputs from a number of other neurons or from the external world was developed. A weighted sum of these inputs constitutes the argument of an activation function. This is a simple, but useful first approximation of a biological neuron. Using this model, many neural structures, usually referred to as feedforward neural networks, have been reported in the literature. Many of these networks use only present values of inputs, and are therefore called instantaneous or static systems. A natural extension of static networks is the dynamic or recurrent neural network which incorporates feedback in its structure. No general theory for dynamic neural networks has yet developed similar to that for static networks. With the parallel growth in the field of fuzzy logic, many neural models encompassing the principles of neural networks and fuzzy set theory are being developed. An attempt is made to provide the basic concepts of static, dynamic, and fuzzy neural structures.<<ETX>>","PeriodicalId":146674,"journal":{"name":"IEEE WESCANEX 93 Communications, Computers and Power in the Modern Environment - Conference Proceedings","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-05-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129824335","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}